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› noisy SPS-8400 - tweaking possible?
04-02-2005 08:06 PM  13 years agoPost 1
soren m

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Denmark, Copenhagen

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I'm using an SPS-8400 (PSU) with my Schulze 6-663+. It works great but the PSU is quite noisy. Is has a "low noise high speed temperature controlled fan". In my opinion its quite noisy when idle and very noisy when I draw 10-15 amps or more. Does any of you know whether this is normal? I suspect that the fan controller isn't adjusted correctly. Atleast it's very konservative. Does any of you have experience changing or adjusting the the fan?

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04-03-2005 10:24 AM  13 years agoPost 2
Andi G

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Switzerland

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Hi,

mine is very loud too, I'm thinking about replacing the fan - there are enough silent fans in computer shops.

Andi

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04-03-2005 04:50 PM  13 years agoPost 3
soren m

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Denmark, Copenhagen

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Good to hear that nothing's wrong with it. Think I´ll replace the fan then.

Søren

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04-03-2005 05:07 PM  13 years agoPost 4
Andi G

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Switzerland

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Hi,

a big part of the noise is from the exhaust holes right behind the fan, if you cut them away and mount a silent fan it should be barely hearable.

Andi

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04-03-2005 10:54 PM  13 years agoPost 5
soren m

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Denmark, Copenhagen

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The grid is gone. It made the noise friendlier. Now I need to decide which fan to purchase.

The original runs 3000 rpm, 71 m3/h, 34 dB. The PSU has about 20% loss equal to 150 W at max load. That again would heat up the air about 10 degrees C if all 71 m3 of air go through the psu.

I've looked at three silent fans:

Noiseblocker S1: 1500 rpm, 38 m3/h, 11 dB and 19 C heat up
Noiseblocker S2: 2000 rpm, 50 m3/h, 19 dB and 15 C heat up.
Noiseblocker S3: 2600 rpm, 65 m3/h, 26 dB and 11 C heat up.

I guess S1 would be the bold choice and S3 the safe one. I'll pick S1 or S2, but want to measure idle/load rpm's and temperatures on the original before I decide. (have to borrow rpm and IR gadgets from a friend)

Søren

(edited for wrong percentage calculation - 600 W and 80 % efficiency gives 150 W loss, not 120 )

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